function [ status ] = mx_open_eyelink_system( bufsize, options )
%MX_OPEN_EYELINK_SYSTEM Use this function to initialize the EyeLink library.
%
% This will also start the millisecond clock. No connection is attempted to 
% the eyetracker yet. It is preferable to call open_eyelink_connection(-1) 
% instead, as this prepares other parts of the DLL for use.
%
% Remarks:
% MUST BE FIRST CALL TO LINK INTERFACE.
% Parameters:
% bufsize 	Size of sample buffer. 60000 is the maximum allowed. (0 for default)
% options 	Text specifying initialization options. Currently no options are supported. (NULL or "" for defaults)
% Returns:
% 0 if failed, nonzero (-1 or TSR SWI number) if success.
%
%----------------------------------------------------------------------------
% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com